Photovoltaic Parameters Improvement Via Size Control of Monodisperse Mie-resonant Nanoparticles in Perovskite Solar Cells

Optically resonant Mie-resonant nanoparticles are powerful tools for light control at the nanoscale, which have been employed for such applications as coloration, and metaoptics, where the size and shape of nanoparticle play a critical role in the device performance. Moreover, such nanoparticles are successfully used for the improvement of perovskite solar cells. However, there is a lack of experimental knowledge on how the size of Mie-resonant nanoparticles affects the improvement of parameters in the photovoltaic devices. Here we apply monodisperse silicon nanoparticles to investigate optical effects responsible for the improvement of perovskite solar cells. The experimental analysis shows that the most optimal sizes of silicon nanoparticles for the perovskite with bandgap 1.53 eV are in the range 140–160 nm. The main reason for such improvement is the optimization of absorption in the perovskite layer around wavelength 500–800 nm, where the Mie resonances in nanoparticles are not completely damped but contribute to additional light trapping and scattering. Our results can be useful not only for further optimization of perovskite solar cells, but also pave the way for improvement of a broader range of photovoltaic devices with integrated Mie-resonant nanoparticles.